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G2040PV DC series are Class C Surge Protection Devices, they designed to protect against lightning surge voltages in photovoltaic power supply networks. These units must be installed in parallel on the DC networks to be protected and provide common and differential modes protection. The G2040PV DC series are available for the main operating voltages in photovoltaic : 800,1000 and 1500 Vdc. The use of Class C Surge Protection Devices are recommended at both ends of the DC power supply line (solar panel side and inverter/converter side), especially if the line routing is external and long. The electrical diagram of the G2040PV DC series are based on high energy MOVs equipped with specific thermal disconnectors and related failure indicators. A remote signal feature is also available
The G2040PV DC series are made with plug-in modules to allow a fast and easy maintenance in case of failure (disconnection from the DC network).
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Q1: What is distributed (cascaded) surge protection?
A:Distributed protection, cascaded protection or coordination is the process of coordinating protection between the primary service entrance of a large facility and the internal branch distribution panels. Generally a surge protective device (SPD) with high surge handling capacity is installed at the service entrance while SPDs of lower surge ratings will be installed on the branch panels or dedicated supplies feeding sensitive equipment. This approach can be taken further to include point-of-use SPDs on long lines where they terminate to sensitive or critical equipment.
Q2: I have a photovoltaic (PV) system with net metering; does it need a surge protection system?
A:Yes. For PV systems, DC surge protection should be installed where the DC voltage from the PV arrays terminates at the charge controller/inverter. AC protection should be installed at the inverter’s AC output to protect it from transients on the utility power lines. This can be caused by lightning or utility switching transients. In certain cases, protection should be located at the PV array locations, and at the array’s local DC control circuits — where applicable.
Q3: Why is the lead (wire) length of an AC SPD so critical?
A:The shorter the lead length between the protector and your panel, the lower the let-through voltages will be to your equipment. This is crucial to the effectiveness of all parallel-connected surge protectors. SPDs are typically connected in parallel with the load. This means that the protector does not carry load current. But more importantly, it means that the SPD must efficiently divert transient currents through it during an overvoltage event. The SPD must momentarily “look” like an electrical short-circuit in order to efficiently divert large amounts of current. The longer the wire, the more inductance it has, and the greater the factor will be. So when installing parallel surge protectors, keep the leads as close to, but not less than, six inches as possible for best performance.